Benzene hexachloride is

Correct order of nucleophilicity for $S_N2$ reaction

Given below are two statements:
Statement $I$: $(Et)_2N-CH_2CH_2Cl$ will undergo alkaline hydrolysis at a faster rate than $(Et)_2CH-CH_2CH_2Cl$.
Statement $II$: Intramolecular substitution takes place first by involving the lone pair of electrons on nitrogen.
In the light of the above statements,choose the most appropriate answer from the options given below:

On heating $CHCl_3$ with aqueous $NaOH$,the product is:

Alkyl halide can be converted into alkene by

What is the correct order of reactivity of halides for the $S_{N}2$ reaction?